基于LVS集群搭建
软件 LVS NGINX硬件：
LVS项目介绍http://www.linuxvirtualserver.org/zh/lvs1.html
lvs体系结构http://www.linuxvirtualserver.org/zh/lvs2.html
lvs集群中ip负载均衡技术http://www.linuxvirtualserver.org/zh/lvs3.html
lvs集群的负载调度http://www.linuxvirtualserver.org/zh/lvs4.html
实现调度
1ipvs
2ipvsadm IPVS管理工具
3.keepalivedhttp://i2.运维网.com/images/blog/201805/11/f86eee84de798b334b2b9e6ea3df77f5.png
4.LVS 工作模式
1) NAT(network address translation)网络地址转换
http://i2.运维网.com/images/blog/201805/21/43d3c5dd371069fc8a1acb96be027611.png
2) TUN(Tunneling) 隧道模式
http://i2.运维网.com/images/blog/201805/21/c97e3e18aff6203f10f97911e23d1aa8.png
http://i2.运维网.com/images/blog/201805/21/b0acf25e374a8e713c90a7975fee0363.png
和DR模式很像，区别是TUN需要VIP与RIP之间创建ip隧道［HAPROXY+IPIP隧道代替简单（不用抑制ARP）］
3) DR(Direct Routing)直接路由 ［互联网常用模式］
详细博客 http://blog.运维网.com/benchmarking/2118974
http://i2.运维网.com/images/blog/201805/23/07fb9550b7f39b6dc743d755ff5497c8.png
4) FULLNAT(Full Network address Translation) 完全NAT模式[淘宝工作模式]
详细文章：https://wenku.baidu.com/view/c0fb13d2b9f3f90f77c61b07.html
http://i2.运维网.com/images/blog/201805/21/2c849de6a82fc3d838fa0a3083c85171.png
5.LVS调度算法
http://i2.运维网.com/images/blog/201805/21/db2c3e4060518fb713758e23a5d95779.png
http://i2.运维网.com/images/blog/201805/21/ef22399ad1edc7f2e434da13f3bb503c.png
http://i2.运维网.com/images/blog/201805/21/a846f9af87ecd0c4d040219ed50d210c.png
http://i2.运维网.com/images/blog/201805/21/70edf41c8637274122ec2717177cbb65.png
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